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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd062c98b5418345c5d79b49bf90adc2379ff58ca238ae7f75e8a2488caf9717b' 
  AND token = 'jGpeFCr4YLc8Nut2EKCYD5T76Ot6mPzPfpdsIzu8OM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}